Manufacture of crepe yarns



Patented Mar. 13, 1934 AC'EFURE F CREPE YAENQ Eduard Boos, Oberbruch,Kreis fieinsberg, Ger= many assigncr to American Glanzstofi Cor=poration, New York, N. K, a corporation of Delaware No Drawing.Application March 1, 1932, Serial No. 596,162. In Germany March 24,193i.

2 Claims. (6]. 28-1) My present invention concerns the production ofcrepe yarn from artificial filaments.

One object of the invention is to provide a novel, yet simple, methodfor the production of crepe yarn.

Other objects will become apparent from a consideration of the followingspecification.

According to one process by which I produce a crepe efiect on artificialfilaments, specifically tions of the yarn, at the same time removing thesulphur therefrom. I have found that undesulphurized yarns possess notedshrinking tendencies and thus the production of a crepe effect yarn isfacilitated.

According to another process wherebyfproduce crepe effect yarn, I makeuse of untwisted artificial filaments. Ordinarily, when twistedfilaments are to be used in the manufacture of crepe yarn, it isnecessary to supply certain of the filaments with a decided left-handtwist. When using yarn which has been twisted, this twist must becompensated for when the crepemaking twist is applied. I overcome thisdifiiculty by leaving the original silk untwisted and collecting it, asit is newly spun, directly upon the usual cylinders, spools or reels.This un-' twisted yarn while upon these holders may be suitably washedand dried; It may then be run directly upon twisting spools, and theproper leftor right-hand twist applied, whereupon it may be used in themanufacture of crepe effect yarn. By proper it is meant that the threadlyes which act to shrink the undesulphurized porduced.

have found that the sulphur acts as a bindingor sizing agent and enablesthe handling of the filaments while they are thusuntwisted.

In the event that this present process is to be used in connection withthe production of viscose filaments according to the spool spinningprocess, it has been found that several steps will be eliminated fromthe usual process and thus danger of damaging the artificial filamentsby handling is decreased. Spool yarn is that which is wound, afterproduction, directly upon a spool. While upon this spool, which may beperforated, for example, the yarn is after-treated without anyintermediate rewindings. According to my present process, I lay theuntwisted yarn directly" upon the spools, treat it by washing, but donot desulphurize it. Thus, as is pointed out above, the sulphurremainsin the filaments to act as a sort of a hinder or sizing andenables the filaments tube handled intheir untwisted state.

The sulphur may be removed from the crepe yarn withoutanydifiicultyafter it has been woven. After the desulphurization of thewoven yarn occurs, the shrinkage of the filaments is occasioned, and thedesired crepe effect is pro- Having now set forth my invention asrequired by the statutes of the United States Patent Ofiice, what Idesire to claim is:

1. In the manufacture of crepe effect fabrics, the steps of producingviscose filament-s, wind- 35 ing them while untwisted upon spools,washing the untwisted filaments without desulphurizing, applying highleftand right-hand twists to the filaments thus produced, making them upinto a fabric, and then desulphurizing the resulting fabric.

2. In the manufacture of crepe effect fabrics, the steps of producingviscose filaments, wind- .ing them while untwisted upon spools, washingthe untwisted filaments without desulphurizing,

applying high leftand right-hand twists to the filaments thus produced,making them up into a fabric, and then desulphurizing the resultingfabric through the use of a dilute caustic so1utiOD. EDUARD BOOS.

